Seasonal Genes(The Scientist)
Our immune systems vary with the seasons, according to a study that could help explain why certain conditions such as heart disease and rheumatoid arthritis are aggravated in winter while people tend to be healthier in the summer.

Common vitamin reduces recurrence of some skin cancers(The Washington Post)Nicotinamide, a cheap over-the-counter vitamin, appears to reduce recurrence of some common skin cancers associated with sun exposure for people who have had them before, researchers at the University of Sydney report.